If you don’t have a Yahoo ID, you'll be asked to create one and your existing data will be accessible with this new Yahoo account.

If you have an existing Yahoo ID already linked to Facebook or Google, sign in with this Yahoo ID since your data is already accessible with that account. If you have an existing Yahoo ID that isn't linked to Facebook or Google, you'll be asked to create a new Yahoo ID. Your existing data will be accessible with this new Yahoo ID.